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Discussion Starter #1
So the RGU sidecar rig has gone dark. Now time to figure out the Street 750 sidecar rig . Factory tire is a bit odd shaped a 140/75R15.
looking at 3 options now that should work. Looks like plenty of room . With a Street tugging a sidecar IMO a tire that lower ration would be better than one that raises it. However 1/2 MPH at 65 would make no real difference.
165/65r15 would be an inch wider than stock and it you be very close on gearing 65.49 vs 65 MPH
165/60R15 would be almost prefect 63.68 vs 65 Mph.
155/60R/15 would work 62.36 vs 65 mph
 

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Discussion Starter #2
Big issue. It seems that once you get down to a 15 inch motorcycle rim things change. A 15 inch Car tire will not fit right on a 15 inch motorcycle rim different size. To expand my efforts .
Is there a 16 inch rim that will direct fit a 2015 Street 750? I Know the 2018 Street Rod has a 17 inch rear wheel. Not giving up yet just more home work.
 

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Discussion Starter #3 (Edited)
This might work. 165/65R15 . On my list to try it maybe it works maybe it goes in bad idea box.

Diameter inches (mm) 23.27 (591) 23.44 (595.5) 0.18 (4.5) 0.8%
Width inches (mm) 5.51 (140) 6.5 (165) 0.98 (25) 17.9%
Circum. inches (mm) 73.1 (1856.68) 73.65 (1870.82) 0.56 (14.14) 0.8%
Sidewall Height inches (mm) 4.13 (105) 4.22 (107.25) 0.09 (2.25) 2.1%
Revolutions per mile (km) 866.79 (538.59) 860.24 (534.52) -6.55 (-4.07) -0.8%
 

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Discussion Starter #4
It did not work, then it did. I must explain a few things so as not to miss lead or add to confusion on the subject.
For get what you did on your old shovel. It does not apply anymore.
Motorcycle wheels have changed in design. They have a raised bead inside the wheel about 1/2 inch from the bead edge. It is designed to help hold the tire on the wheel when it goes flat.
Yes a 15 inch car tire will fit on a 15 inch motorcycle wheel. I had a spare wheel from a wrecked bike 15 inch Street 750. I was tried of the BS and wrong information I was getting. Got the spoons out. Cleaned off the rust and wen to work. A use 15 tire form local tire deal was donate. Tire went on as it should . Air it up. 90% of the bread seated but about 10% on inside and out side would not seat. I tried over and over. Then Took the tire back off. Then Notice the tire bread was not popping over that inside ridge. Lubes the wheel good. Put tire back on again. put the air to it same crap. Decide to either seat it or blow it up. Put tire in a home made cage long hose and ran it up at 110 pound it popped into place. prefect fit Let air back down to 35 pounds all good, holding air as it should.
Talked with dealer and he said it often requires an over fill to set the bread. So yes it can be done. Now I have to pick the right car tire for this rig and finish it when we get back.
This was just a scrap tire used to try it.
 

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Thanks for all the documentation. Looking forward to hearing you thoughts in a few thousand miles.

BTW. How much do you take the Street out compared to the RGU?
 

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Discussion Starter #7
Thanks for all the documentation. Looking forward to hearing you thoughts in a few thousand miles.

BTW. How much do you take the Street out compared to the RGU?
Now that the RGU has the sidecar, we use it most to give Payton rides and take her places. Some of that is due to I took two of my Fabbed mounts off and used them to mount one for a friend. Wanted to get him on the road with his first sidecar. I have now finish making new ones for mine and will be putting it back on the Street in a couple days, if nothing else comes up. I ride between 20,000 and 60.000 a year so all 3 bikes get a fair amount of use.
This is how the tire looks on the Street.
 

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That a lot of miles on two / three wheels. I think I'm a little envious...
 

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Discussion Starter #10
I rode the bike awhile with out the sidecar. The tire worked well. Playing a bit the found the front end will come up easier rather than spin the tire as it did with stock tire. You can feel the bike is a bit quicker with the smaller tire.
Put sidecar back on. it works great. After a few miles to get the feel of it I started to play. Flew the car just over a mile at low and high speeds it had no issues. Down the road I still want to try a 165/60R15.
The 155/60r15 was a safe bet.
 
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smitty901
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